Organic Gemstone (Not A Rock Or Mineral In The Traditional Sense, But Bio Mineralized Material)

Charoite

Charoite (Hydrated potassium sodium calcium barium strontium silicate hydroxyfluoride)

Granite (Alkali-feldspar Granite)

Felsic Plutonic Rock (Primary minerals: Quartz SiO2, Orthoclase KAlSi3O8, Plagioclase (Na,Ca)AlSi3O8)

Peridot (Olivine)

(Mg,Fe)2SiO4 (Magnesium Iron Silicate)

Amethyst (Druze)

Silicon Dioxide (SiO2) with iron impurities

Banded Agate (specifically Lake Superior Agate style)

Silicon Dioxide (SiO2) - Chalcedony variety

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Chert (also known as Flint or Common Chalcedony)

Cryptocrystalline Silica (SiO2)

Amethyst Quartz

Amethyst (SiO2 with Iron impurities)

Amethyst

Quartz (Silicon Dioxide) - SiO2 with Iron impurities

Basalt

Basalt

Chrysoprase

Chalcedony (cryptocrystalline SiO2 variety)

Chert (specifically Flint or Common Chert node)

Silicon Dioxide (SiO2)

Diamond

Native Carbon (C)

Moonstone

Orthoclase Feldspar (composed of alternate layers of orthoclase and albite), (K,Na)AlSi3O8

Gneiss

Gneiss (a rock type, not a specific mineral with a formula)

Assorted Semi-Precious Gemstone Crosses

Quartz, Silicates, Carbonates (various)

Malachite

Malachite (Cu2(CO3)(OH)2 - a copper carbonate hydroxide mineral)

Black Tourmaline

Schorl (Na(Fe²⁺)₃Al₆(OH)₄(BO₃)₃Si₆O₁₈)

Milky Quartz

Silicon Dioxide (SiO2)

Stichtite (often found in Serpentinite)

Stichtite Mg6Cr2CO3(OH)16·4H2O

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Clear Quartz/Rock Crystal)

Silicon Dioxide (SiO2)

Clear Quartz (Crystal Quartz)

Silicon Dioxide (SiO2)

Agate

Silicon Dioxide (SiO2) - variety of Chalcedony

Flower Agate

Chalcedony (Silicon Dioxide, SiO2) with Opaque Spherulitic Inclusions

Rough Emerald

Beryl (Be3Al2(SiO3)6 with Chromium/Vanadium impurities)

Quartz

Quartz (Silicon Dioxide - SiO2)

Epidote

Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

Epidote

Epidote Group (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Quartz / Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Epidosite (Epidote-rich rock)

Epidosite (consisting primarily of Epidote: {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))

Goldstone (with Tiger's Eye and Quartz)

Aventurine glass (Synthetic SiO2 with Cu inclusions)

Garnet Schist

Almandine Garnet in Mica Schist (Fe3Al2(SiO4)3)

Granite

Granite (felsic intrusive igneous rock)

Prehnite

Prehnite, Ca2Al(AlSi3O10)(OH)2

Rough Ruby

Corundum (Al2O3 with Chromium impurities)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Amethyst (Tumbled)

Silicon Dioxide (SiO2) with iron impurities

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Dumortierite Quartz (Blue Quartz)

Al7BO3(SiO4)3O3 (Aluminum Boro-silicate included in Quartz)

Sandstone

Sandstone (lithified sand)

Amethyst

Amethyst (Silicon Dioxide, SiO2)